Question

the units digits of a two digit number is 2 and seven times the sum of the digits is the number itself find the number ​

Answer 1

Answer:

42

Step-by-step explanation:

Let the number 10's digit of the number be x.

sum of digits = x + 2

7 (x+2) = 10x + 2

7x + 14 = 10x + 2

10x - 7x = 14- 2

3x = 12

x = 12/3

x= 4

So, the required number is 42.

Answer 2

Answer:

Let tens digit = x

Units digit = 3

∴Number = 3 + 10x

According to the condition,

7 (x + 3) = 3 + 10x

7x + 21 = 3 + 10x

21 – 3 = 10x – 7x

=> 3x = 18

x = 183

∴Number = 3 + 10x

= 3 + 10 x 6 = 3 + 60 = 63

Step-by-step explanation: